Ebay listing editor software or something similar.

Hey guys, I'm looking for some type of software or anything that can edit live eBay listings in one go, something that would crawl them all and either add code or replace code would be perfect. I know it's possible because sites like Auctivia add their sliders to all your live listings. If it helps anyone understand what i need, the problem is that my listings are all HTML and at the bottom of the listing there are pictures which link to related items but as one of them had to be relisted, the link to it is wrong and we literally have thousands of listings, so doing it manually would just take too much time that we don't have.


Thanks in advance